SUBARU FORESTER 2004 Service Repair Manual
Manufacturer: SUBARU, Model Year: 2004, Model line: FORESTER, Model: SUBARU FORESTER 2004Pages: 2870, PDF Size: 38.67 MB
Page 1171 of 2870
EN(H4SO)-73
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0130 O2 Sensor Circuit (Bank 1 Sensor 1)
P0131 O
2 Sensor Circuit Low Voltage (Bank
1 Sensor 1)
Code (DTC).>
P0132 O
2 Sensor Circuit High Voltage
(Bank 1 Sensor 1)
Code (DTC).>
P0133 O
2 Sensor Circuit Slow Response
(Bank 1 Sensor 1)
Trouble Code (DTC).>
P0134 O
2 Sensor Circuit No Activity
Detected (Bank 1 Sensor 1)
Trouble Code (DTC).>
P0137 O
2 Sensor Circuit Low Voltage (Bank
1 Sensor 2)
Code (DTC).>
P0138 O
2 Sensor Circuit High Voltage
(Bank 1 Sensor 2)
Code (DTC).>
P0139 O
2 Sensor Circuit Slow Response
(Bank 1 Sensor 2)
Trouble Code (DTC).>
P0171 System Too Lean (Bank 1)
P0172 System Too Rich (Bank 1)
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0304 Cylinder 4 Misfire Detected
P0327 Knock Sensor 1 Circuit Low Input
(Bank 1 or Single Sensor)
nostic Trouble Code (DTC).>
P0328 Knock Sensor 1 Circuit High Input
(Bank 1 or Single Sensor)
nostic Trouble Code (DTC).>
P0335 Crankshaft Position Sensor “A” Cir-
cuit
P0336 Crankshaft Position Sensor “A” Cir-
cuit Range/Performance
nostic Trouble Code (DTC).>
P0340 Camshaft Position Sensor “A” Circuit
(Bank 1 or Single Sensor)
nostic Trouble Code (DTC).>
P0341 Camshaft Position Sensor “A” Circuit
Range/Performance (Bank 1 or Sin-
gle Sensor)
nostic Procedure with Diagnostic Trouble Code (DTC).>
P0400 Exhaust Gas Recirculation Flow
Page 1172 of 2870
EN(H4SO)-74
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0420 Catalyst System Efficiency Below
Threshold (Bank 1)
Trouble Code (DTC).>
P0458 Evaporative Emission Control Sys-
tem Purge Control Valve Circuit Low
cedure with Diagnostic Trouble Code (DTC).>
P0459 Evaporative Emission Control Sys-
tem Purge Control Valve Circuit High
Procedure with Diagnostic Trouble Code (DTC).>
P0461 Fuel Level Sensor Circuit Range/Per-
formance
Code (DTC).>
P0462 Fuel Level Sensor Circuit Low Input
P0463 Fuel Level Sensor Circuit High Input
P0464 Fuel Level Sensor Circuit Intermittent
(DTC).>
P0483 Cooling Fan Rationality Check
P0502 Vehicle Speed Sensor Circuit Low
Input
P0503 Vehicle Speed Sensor Intermittent/
Erratic/High
P0506 Idle Control System RPM Lower
Than Expected
Code (DTC).>
P0507 Idle Control System RPM Higher
Than Expected
Code (DTC).>
P0512 Starter Request Circuit
P0513 Incorrect Immobilizer Key
P0519 Idle Control System Malfunction
(Fail-Safe)
(DTC).>
P0565 Cruise Control On Signal
P0604 Internal Control Module Random
Access Memory (RAM) Error
nostic Trouble Code (DTC).>
P0691 Cooling Fan 1 Control Circuit Low
P0692 Cooling Fan 1 Control Circuit High
P0703 Torque Converter/Brake Switch “B”
Circuit
(DTC).>
P0705 Transmission Range Sensor Circuit
(PRNDL Input)
P0710 Transmission Fluid Temperature
Sensor Circuit
P0716 Torque converter turbine speed sen-
sor
Page 1173 of 2870
EN(H4SO)-75
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0720 AT Vehicle Speed Sensor Circuit
Malfunction
P0726 Engine Speed Input Circuit Malfunc-
tion
P0731 Gear 1 Incorrect Ratio
P0732 Gear 2 Incorrect Ratio
P0733 Gear 3 Incorrect Ratio
P0734 Gear 4 Incorrect Ratio
P0741 Torque Converter Clutch Circuit Per-
formance or Stuck Off
Diagnostic Trouble Code (DTC).>
P0743 Torque Converter Clutch Circuit Elec-
trical
P0748 Pressure Control Solenoid “A” Elec-
trical
P0753 Shift Solenoid “A” Electrical
P0758 Shift Solenoid “B” Electrical
P0771 Low clutch timing solenoid
P0778 Pressure Control Solenoid “B” Elec-
trical
P0785 Shift/Timing Solenoid
P0851 Neutral Switch Input Circuit Low
(MT MODEL), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
P0852 Neutral Switch Input Circuit High
P0864 TCM Communication Circuit Range/
Pe r fo r ma nc e
Code (DTC).>
P0865 TCM Communication Circuit Low
P0866 TCM Communication Circuit Low
P1110 Atmospheric Pressure Sensor Circuit
Malfunction (Low Input)
Diagnostic Trouble Code (DTC).>
P1111 Atmospheric Pressure Sensor Circuit
Malfunction (High Input)
Diagnostic Trouble Code (DTC).>
P1134 A/F Sensor Micro-Computer Problem
P1137 O
2 Sensor Circuit (Lambda= 1)
(Bank 1 Sensor 1)
(DTC).>
P1492 EGR Valve Signal #1 Circuit Malfunc-
tion (Low Input)
ble Code (DTC).> DTC Item NOTE
Page 1174 of 2870
EN(H4SO)-76
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P1493 EGR Valve Signal #1 Circuit Malfunc-
tion (High Input)
ble Code (DTC).>
P1494 EGR Valve Signal #2 Circuit Malfunc-
tion (Low Input)
ble Code (DTC).>
P1495 EGR Valve Signal #2 Circuit Malfunc-
tion (High Input)
ble Code (DTC).>
P1496 EGR Valve Signal #3 Circuit Malfunc-
tion (Low Input)
ble Code (DTC).>
P1497 EGR Valve Signal #3 Circuit Malfunc-
tion (High Input)
ble Code (DTC).>
P1498 EGR Valve Signal #4 Circuit Malfunc-
tion (Low Input)
ble Code (DTC).>
P1499 EGR Valve Signal #4 Circuit Malfunc-
tion (High Input)
ble Code (DTC).>
P1510 ISC Solenoid Valve Signal #1 Circuit
Malfunction (Low Input)
nostic Trouble Code (DTC).>
P1511 ISC Solenoid Valve Signal #1 Circuit
Malfunction (High Input)
nostic Trouble Code (DTC).>
P1512 ISC Solenoid Valve Signal #2 Circuit
Malfunction (Low Input)
nostic Trouble Code (DTC).>
P1513 ISC Solenoid Valve Signal #2 Circuit
Malfunction (High Input)
nostic Trouble Code (DTC).>
P1514 ISC Solenoid Valve Signal #3 Circuit
Malfunction (Low Input)
nostic Trouble Code (DTC).>
P1515 ISC Solenoid Valve Signal #3 Circuit
Malfunction (High Input)
nostic Trouble Code (DTC).>
P1516 ISC Solenoid Valve Signal #4 Circuit
Malfunction (Low Input)
nostic Trouble Code (DTC).>
P1517 ISC Solenoid Valve Signal #4 Circuit
Malfunction (High Input)
nostic Trouble Code (DTC).>
P1518 Starter Switch Circuit Low Input
P1560 Back-Up Voltage Circuit Malfunction
P1570 ANTENNA
P1571 Reference Code Incompatibility
P1572 IMM Circuit Failure
P1574 Key IMM Circuit Failure
Page 1175 of 2870
EN(H4SO)-77
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P1576 EGI Control Module EEPROM
P1577 IMM Control Module EEPROM
P1698 Engine Torque Control Cut Signal
Circuit Malfunction (Low Input)
with Diagnostic Trouble Code (DTC).>
P1699 Engine Torque Control Cut Signal
Circuit Malfunction (High Input)
with Diagnostic Trouble Code (DTC).>
P1700 Throttle Position Sensor Circuit Mal-
function For AT
P1711 Engine Torque Control Signal #1 Cir-
cuit Malfunction
Trouble Code (DTC).>
P1712 Engine Torque Control Signal #2 Cir-
cuit Malfunction
Trouble Code (DTC).> DTC Item NOTE
Page 1176 of 2870
EN(H4SO)-78
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
19.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode
WIRING DIAGRAM:
EN-02384
B18
3412
56
B47F44
12345678
B136B135
1234
B21
123
4
56
78
9
1011 12
1314 15 16
SBF-5
EE
B47
B18
6
4
5
3
2
1
B23 C13
C22C6 C17
C16
C5
8
B:
C:B135
B136
B21
E2 ECMBATTERY
B61F44
7
FRONT OXYGEN
(A/F) SENSOR MAIN RELAY
567
82 1
94
310
24
22 23251112131415
26 27
281617181920 21
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18
LHDLHD
RHDRHD
4
3
1 2
B: C:
Page 1177 of 2870
EN(H4SO)-79
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Start the engine, and warm-up the engine.
2) Turn the ignition switch to OFF.
3) Disconnect the connector from ECM and
front oxygen (A/F) sensor.
4) Measure the resistance of harness
between ECM and front oxygen (A/F) sensor
connector.
Connector & terminal
(B136) No. 6 — (B18) No. 3:
(B136) No. 17 — (B18) No. 3:Is the resistance less than 1
Ω?Go to step 2.Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
2 CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
Measure the resistance of harness between
ECM and front oxygen (A/F) sensor connector.
Connector & terminal
(B136) No. 13 — (B18) No. 1:
(B136) No. 22 — (B18) No. 2:Is the resistance less than 1
Ω?Go to step 3.Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
3 CHECK HARNESS BETWEEN MAIN RELAY
AND FRONT OXYGEN (A/F) SENSOR CON-
NECTOR.
Measure the resistance of harness between
main relay and front oxygen (A/F) sensor con-
nector.
Connector & terminal
(B47) No. 4 — (B18) No. 4:Is the resistance less than 1
Ω?Go to step 4.Repair open circuit
in harness
between ECM and
front oxygen (A/F)
sensor connector.
4 CHECK FRONT OXYGEN (A/F) SENSOR.
Measure the resistance between front oxygen
(A/F) sensor connector terminals.
Te r m i n a l s
No. 3 — No. 4:Is the resistance less than 5
Ω?Go to step 5.Replace the front
oxygen (A/F) sen-
sor.
Front Oxygen (A/
F) Sensor.>
5 CHECK POOR CONTACT.
Check poor contact in ECM and front oxygen
(A/F) sensor connector. Is there poor contact in ECM or
front oxygen (A/F) sensor con-
nector?Repair poor con-
tact in ECM or
front oxygen (A/F)
sensor connector.Replace the front
oxygen (A/F) sen-
sor.
Front Oxygen (A/
F) Sensor.>
Page 1178 of 2870
EN(H4SO)-80
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
B: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode
WIRING DIAGRAM:
EN-02384
B18
3412
56
B47F44
12345678
B136B135
1234
B21
123
4
56
78
9
1011 12
1314 15 16
SBF-5
EE
B47
B18
6
4
5
3
2
1
B23 C13
C22C6 C17
C16
C5
8
B:
C:B135
B136
B21
E2 ECMBATTERY
B61F44
7
FRONT OXYGEN
(A/F) SENSOR MAIN RELAY
567
82 1
94
310
24
22 23251112131415
26 27
281617181920 21
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18
LHDLHD
RHDRHD
4
3
1 2
B: C:
Page 1179 of 2870
EN(H4SO)-81
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P0031 and
P0037 at the same time?Go to step 2.Go to step 5.
2 CHECK POWER SUPPLY TO FRONT OXY-
GEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from front oxygen
(A/F) sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between front oxygen
(A/F) sensor connector and engine ground.
Connector & terminal
(B18) No. 4 (+) — Engine ground (
−):Is the voltage more than 10 V? Go to step 3.Repair the power
supply line.
N
OTE:
In this case repair
the following:
Open circuit in
harness between
main relay and
front oxygen (A/F)
sensor connector
Poor contact in
front oxygen (A/F)
sensor connector
Poor contact in
main relay connec-
tor
3 CHECK GROUND CIRCUIT FOR ECM.
Measure the resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B136) No. 5 — Chassis ground:
(B136) No. 16 — Chassis ground:Is the resistance less than 5
Ω?Go to step 4.Repair harness
and connector.
N
OTE:
In this case repair
the following:
Open circuit in
harness between
ECM and engine
ground terminal
Poor contact in
ECM connector.
Poor contact in
coupling connector
4 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of front oxygen (A/F) sensor
heater current using Subaru Select Monitor or
OBD-II general scan tool.
N
OTE:
Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.Is the current more than 0.2 A? Repair poor con-
tact connector.
N
OTE:
In this case repair
the following:
Poor contact in
front oxygen (A/F)
sensor connector
Poor contact in
ECM connector.Go to step 5.
5 CHECK INPUT SIGNAL FROM ECM.
1) Start and idle the engine.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 6 (+) — Chassis ground (
−):
(B136) No. 17 (+) — Chassis ground (
−):Is the voltage less than 1 V? Go to step 7.Go to step 6.
6 CHECK OUTPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 6 (+) — Chassis ground (
−):
(B136) No. 17 (+) — Chassis ground (
−):Is the voltage less than 1 V by
shaking the ECM harness and
connector while monitoring the
value of voltage meter?Repair the poor
contact in ECM
connector.Go to step 7.
Page 1180 of 2870
EN(H4SO)-82
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7 CHECK FRONT OXYGEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between front oxy-
gen (A/F) sensor connector terminals.
Te r m i n a l s
No. 3 — No. 4:Is the resistance less than 10
Ω?Repair harness
and connector.
N
OTE:
In this case repair
the following:
Open or ground
short circuit in har-
ness between front
oxygen (A/F)
sensor and ECM
connector
Poor contact in
front oxygen (A/F)
sensor connector
Poor contact in
ECM connector.Replace the front
oxygen (A/F) sen-
sor.
Fuel.> Step Check Yes No